Mirror bifold door spring thing with plastic cap

A home owner from Glen Ellyn, IL says:
Help! Nothing on your site looks exactly like this part from my bedroom closet. I've lived here over 13 years and it was taped like this before I moved in, but it's broken beyond a tape fix. (Condo was built in 1981 and these are original). The door won't stay in the track and flys open and is basically open all the time and completely on the way.
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Paul from SWISCO responded:

Thanks for posting on our discussion board. Your inquiry is still being reviewed. We ask that you hold on just a while longer. Once we have completed our review, we will provide you with an update. 

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Paul from SWISCO responded:

Do you think you can use our nylon cap, # 21-111 as a replacement? Take a closer look and see what you think.

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